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本文在详述微缩扩容法的基础上,给出了在PC-1500机上建立前兆观测资料微缩字符型实用数据库的通用程序;稍作扩展,还可用于建立相应的地震目录库。该法可以提高数值数据、读带、记带速度、节约磁带,经我站近一年前兆综合分析的实践,效果良好。 1.微缩扩容法 如果用数组等直接法存贮数据,读、写速度慢,且必须对数据定维。一旦定维,一个数占八个字节便成定局,不仅占用存贮空间大,且读写速度也很慢。
Based on the detail expansion and contraction method, this paper gives a general procedure to establish a miniature character-type utility database for precursor observation data on PC-1500. With a little extension, it can also be used to build a corresponding earthquake catalog. The law can improve the numerical data, read tape, tape speed, save the tape, by our station nearly a year before the trillion comprehensive analysis of practice, the effect is good. 1. Miniaturization method If you use an array of direct data storage, read and write speed is slow, and the data must be dimensioned. Once the dimension, a number of eight bytes is a foregone conclusion, not only occupy a large storage space, and read and write speed is very slow.